Learn more about volcanos and volcano hazards from the U.S. Geological Survey Cascades Volcano Observatory website at: http://vulcan.wr.usgs.gov/.

Photography on this website was taken by Phil Stoffer in 2004. This website contains images produced from stereo photo
pairs that were manipulated into anaglyphs (3-D images). You
will need red-and-cyan stereo viewing glasses to get the 3-D visual effects.